What this check does
OrbitProbe opens an HTTPS connection to the site, follows up to five redirects and records the final HTTP status code, the time until the first byte of the answer, the Server header and the first 64 KB of the page, from which the title and meta tags are read. If HTTPS does not answer, plain HTTP is tried.
The result is one observation from one place at one moment. A site can be reachable from our server and unreachable for you because of your network, your DNS resolver or a regional outage, and the other way round. For a second opinion on DNS, use the propagation checker.